Johnson Reservoir Report
Nearby: Skoyen Osseo Rod And Gun Club
Last Updated: December 13, 2025
Johnson is a private dam located in Trempealeau, Wisconsin, along the Tr Elk Creek.
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Summary
Built in 1976 by the USDA NRCS, this earth dam stands at a height of 26 feet and spans a length of 380 feet. It serves as a water resource structure with a primary purpose categorized as "Other" and is funded, designed, and constructed by the Natural Resources Conservation Service.
With a maximum storage capacity of 40 acre-feet and a normal storage capacity of 17 acre-feet, Johnson has a low hazard potential and a moderate risk assessment rating of 3. While the condition assessment is not available, the dam is subject to inspection every 10 years. It features an uncontrolled spillway and outlet gates, indicating its limited control over water discharge.
Despite its relatively low hazard potential, Johnson plays a crucial role in managing water resources in the area. As a significant structure along Tr Elk Creek, this dam contributes to flood control and water storage efforts, showcasing the importance of maintaining and monitoring such infrastructure for the benefit of both the environment and the community.
Year Completed |
1976 |
Dam Length |
380 |
Dam Height |
26 |
River Or Stream |
Tr Elk Creek |
Primary Dam Type |
Earth |
Nid Storage |
40 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Trempealeau River At Arcadia
|
400cfs |
Black River Ds St Hwy 54 @ Black River Falls
|
256cfs |
Trempealeau River At Dodge
|
953cfs |
Chippewa River At Chippewa Falls
|
1490cfs |
Black River Near Galesville
|
862cfs |
Black River At Neillsville
|
193cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Johnson